Microvascular Angina
Microvascular angina is chest pain caused by problems in the heart’s smallest blood vessels. These tiny vessels do not open properly, which cuts oxygen flow to the heart muscle.
Unlike typical angina, the large arteries often look normal on standard tests. The problem sits in vessels too small for a regular angiogram to detect.
Many people with this condition go years without a correct diagnosis.
What Is Microvascular Angina?
Your heart gets blood through large coronary arteries. But small vessels do the final work of delivering oxygen deep into the heart muscle.
In microvascular angina, these small vessels do not work correctly. They may not widen during exercise. They may go into spasm without warning.
This reduces blood flow. The heart muscle does not get enough oxygen. That is what causes the pain.
It is also called cardiac syndrome X.
Microvascular Angina Symptoms
Symptoms can feel like other types of chest pain. This is why it is often missed.
Common symptoms include chest pain or pressure, shortness of breath, fatigue, dizziness, nausea, and sweating.
The discomfort often feels like heaviness or tightening. It can last 15 minutes or longer. It does not ease quickly with rest.
Women may feel extreme fatigue, jaw pain, or back pain instead of chest pain.
What Causes Microvascular Angina?
The main cause is coronary microvascular dysfunction. The small blood vessels in the heart stop working normally.
Two problems can occur. The vessels may not widen when the heart works harder. Or they may go into spasm and cut off blood flow.
Other causes include inflammation, endothelial dysfunction, and hormonal changes. Conditions like dilated cardiomyopathy and heart valve regurgitation can also contribute.
Why Is the Angiogram Normal?
A standard angiogram shows large coronary arteries. It does not show the tiny vessels.
The small vessels are under 500 microns. They do not appear on a regular angiogram.
So a normal result does not mean everything is fine. The problem is in a part of the heart the test simply cannot see.
According to the American Heart Association, up to 50 percent of women with angina symptoms do not have a blocked artery.
How Is Microvascular Angina Diagnosed?
Standard tests often miss this condition. Doctors may use additional tools to find it.
Tests include stress test, cardiac PET scan, cardiac MRI, coronary flow reserve testing, and ECG.
A coronary calcium score can also help assess overall arterial health alongside microvascular testing.
Diagnosis is confirmed when symptoms are present, no major blockage is found, and small vessel dysfunction is proven.
Treatment and Prevention
Treatment focuses on improving blood flow and lowering cardiovascular risk.
Medications include beta blockers, calcium channel blockers, nitrates, ACE inhibitors, and statins.
Lifestyle changes are key. Regular exercise, a heart-healthy diet, weight control, stress reduction, and stopping smoking all help.
Conditions like aortic dissection and cardiac tamponade raise added cardiovascular stress. Managing all heart conditions together gives the best results.
Final Thoughts
Microvascular angina is a real and often missed heart condition.
The pain is real even when the angiogram looks normal. The damage can build silently over time.
Looking beyond standard tests gives a clearer picture of true cardiovascular risk.
Early testing and consistent treatment protect your heart for the long term.